參數(shù)資料
型號(hào): PCA9536
廠商: NXP Semiconductors N.V.
英文描述: 4-bit I2C and SMBus I/O port
中文描述: 4位I2C和SMBus I / O端口
文件頁數(shù): 5/16頁
文件大?。?/td> 153K
代理商: PCA9536
Philips Semiconductors
Objective data sheet
PCA9536
4-bit I
2
C and SMBus I/O port
2004 Aug 20
5
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O3
WRITE PULSE
DATA FROM
SHIFT REGISTER
V
DD
I/O0 TO I/O3
V
SS
WRITE
CONFIGURATION
PULSE
D
C
K
FF
Q
D
C
K
Q
FF
D
C
K
Q
FF
D
C
K
Q
FF
INPUT PORT
REGISTER
POLARITY
INVERSION
REGISTER
OUTPUT
PORT
REGISTER
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
POLARITY
PULSE
CONFIGURATION
REGISTER
OUTPUT PORT
REGISTER DATA
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
READ PULSE
SW02192
Q
Q
Q
Q
100 k
Q1
Q2
ESD PROTECTION DIODE
ESD PROTECTION DIODE
NOTE:
At Power-on Reset, all registers return to default values.
Figure 3. Simplified schematic of I/O0 to I/O3
I/O port
When an I/O is configured as an input, FETs Q1 and Q2 are off, creating a high impedance input with a weak pull-up (100 k
typ.) to V
DD
. The
input voltage may be raised above V
DD
to a maximum of 5.5 V.
If the I/O is configured as an output, then either Q1 or Q2 is enabled, depending on the state of the output port register. Care should be
exercised if an external voltage is applied to an I/O configured as an output because of the low impedance paths that exist between the pin and
either V
DD
or V
SS
.
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